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Python client library for Luxpower/EG4 inverters and solar equipment

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# pylxpweb

A Python client library for Luxpower/EG4 solar inverters and energy storage systems.

[![PyPI Version][pypi-shield]][pypi]
[![Python Versions][pyversions-shield]][pypi]
[![License][license-shield]](https://raw.githubusercontent.com/joyfulhouse/pylxpweb/main/LICENSE)
[![CI][ci-shield]][ci]
[![GitHub Sponsors][sponsors-shield]][sponsors]
[![Ko-fi][kofi-shield]][kofi]

## What It Does

pylxpweb provides programmatic access to Luxpower/EG4 inverters — via the cloud web
monitoring API or a direct local connection — enabling Python applications and Home
Assistant integrations to read real-time inverter data, energy statistics, battery
information, and GridBOSS metrics. It is the library backing the
[EG4 Web Monitor][crosslink] Home Assistant integration.

## Features

- **Complete API Coverage**: Inverter runtime, energy statistics, battery BMS, and GridBOSS data
- **Device Object Hierarchy**: High-level `Station` → `ParallelGroup` → `BaseInverter` / `MIDDevice` / `BatteryBank` → `Battery` objects with auto-scaled properties
- **Async/Await**: Built on `aiohttp` for efficient async I/O
- **Session Management**: Automatic authentication and session renewal
- **Smart Caching**: Configurable TTL caching to minimise API calls
- **Type Safe**: Comprehensive type hints and Pydantic models throughout
- **Error Handling**: Robust error handling with automatic retry and backoff
- **Regional Endpoints**: Supports all global Luxpower and EG4 endpoints
- **Control Operations**: Read and write inverter parameters, enable quick charge, set SOC limits
- **Multiple Transports**: cloud API, local WiFi dongle, direct Modbus (RS-485), or hybrid local+cloud

## Supported Devices

- **Inverters**: FlexBOSS21, FlexBOSS18, 18KPV, 12KPV, XP series, and LXP variants
- **GridBOSS**: Microgrid interconnection devices (MID)
- **Batteries**: All EG4-compatible battery modules with BMS integration

## Supported Regional Endpoints

| Region | Endpoint |
|--------|----------|
| US (EG4 Electronics) | `https://monitor.eg4electronics.com` (default) |
| US (Luxpower) | `https://us.luxpowertek.com` |
| Americas (Luxpower) | `https://na.luxpowertek.com` |
| Europe (Luxpower) | `https://eu.luxpowertek.com` |
| Asia Pacific (Luxpower) | `https://sea.luxpowertek.com` |
| Middle East & Africa (Luxpower) | `https://af.luxpowertek.com` |
| China (Luxpower) | `https://server.luxpowertek.com` |

The base URL is fully configurable to support regional variations and future endpoints.

## Supported Transports

- **Cloud (web API)** — the original access method, via the regional endpoints above.
- **WiFi dongle** — connects locally to the inverter's WiFi dongle (the same device that
  uploads data to the cloud), using Modbus encapsulated in a proprietary frame format.
  - The dongle serves the cloud and local clients at the same time but does not clearly
    separate which side requested what, so occasional *"Response mismatch"* debug messages
    are expected — the library detects a response meant for the cloud and retries.
  - Dongles with encryption enabled (label **E-WIFI ENC**) do not work locally; if you
    have one, ask Luxpower support to downgrade its firmware.
- **Modbus** — a direct Modbus connection to the inverter's RS-485 port.
- **Hybrid** — combines one local connection with the cloud API (local polling with cloud
  fallback and cloud-only supplemental data).

A local connection must have a **single client**: sharing the same dongle or RS-485 line
between multiple applications (e.g. Home Assistant plus a script, or two Home Assistant
instances) causes interleaved responses, data corruption, and intermittent errors.

## Installation

See **[INSTALL.md](INSTALL.md)** for the complete guide.

```bash
pip install pylxpweb
# or
uv add pylxpweb
```

Requires Python 3.13+.

## Quick Start

### Using Device Objects (Recommended)

```python
import asyncio
from pylxpweb import LuxpowerClient
from pylxpweb.devices.station import Station

async def main():
    async with LuxpowerClient(
        username="your_username",
        password="your_password",
        base_url="https://monitor.eg4electronics.com"
    ) as client:
        stations = await Station.load_all(client)
        station = stations[0]

for inverter in station.all_inverters:
            await inverter.refresh()
            print(f"{inverter.model} {inverter.serial_number}:")
            print(f"  PV Power: {inverter.pv_total_power}W")
            print(f"  Battery: {inverter.battery_soc}% @ {inverter.battery_voltage}V")
            print(f"  Grid: {inverter.grid_voltage_r}V @ {inverter.grid_frequency}Hz")
            print(f"  Today: {inverter.total_energy_today}kWh")

asyncio.run(main())
```

Device objects handle all value scaling automatically — no manual division required.

## Usage

### Low-Level API Access

For direct endpoint calls without the device-object layer:

```python
async with LuxpowerClient(username, password) as client:
    plants = await client.api.plants.get_plants()
    plant_id = plants.rows[0].plantId
    devices = await client.api.devices.get_devices(str(plant_id))
    serial = devices.rows[0].serialNum

runtime = await client.api.devices.get_inverter_runtime(serial)
    # Raw API returns scaled integers — divide as needed:
    print(f"Grid Voltage: {runtime.vacr / 10}V")
    print(f"Grid Frequency: {runtime.fac / 100}Hz")
    print(f"Battery Voltage: {runtime.vBat / 10}V")
```

### Control Operations

```python
async with LuxpowerClient(username, password) as client:
    serial = "1234567890"
    await client.set_quick_charge(serial, enabled=True)
    await client.set_charge_soc_limit(serial, limit=90)
    await client.set_operating_mode(serial, mode="standby")
    params = await client.read_parameters(serial, [21, 22, 23])
```

### Error Handling

```python
from pylxpweb import LuxpowerClient, AuthenticationError, ConnectionError, APIError

try:
    async with LuxpowerClient(username, password) as client:
        runtime = await client.get_inverter_runtime(serial)
except AuthenticationError as e:
    print(f"Login failed: {e}")
except ConnectionError as e:
    print(f"Network error: {e}")
except APIError as e:
    print(f"API error: {e}")
```

### Data Scaling

Device objects auto-scale all values. For raw API use, apply these factors manually:

| Data Type | Factor | Example raw | Scaled |
|-----------|--------|-------------|--------|
| Inverter Voltage | ÷10 | 2410 | 241.0 V |
| Battery Voltage (Bank) | ÷10 | 539 | 53.9 V |
| Battery Voltage (Module) | ÷100 | 5394 | 53.94 V |
| Cell Voltage | ÷1000 | 3364 | 3.364 V |
| Current | ÷100 | 1500 | 15.00 A |
| Frequency | ÷100 | 5998 | 59.98 Hz |
| Power | Direct | 1030 | 1030 W |
| Temperature | Direct | 39 | 39 °C |
| Energy | ÷10 | 184 | 18.4 kWh |

See [docs/SCALING_GUIDE.md](docs/SCALING_GUIDE.md) for the full reference.

## API Reference

Full reference documentation lives in [docs/](docs/). Key entry points:

| Document | Contents |
|----------|----------|
| [docs/api/LUXPOWER_API.md](docs/api/LUXPOWER_API.md) | Complete endpoint catalog, authentication, error codes |
| [docs/PROPERTY_REFERENCE.md](docs/PROPERTY_REFERENCE.md) | All device properties with types and scaling |
| [docs/PARAMETER_REFERENCE.md](docs/PARAMETER_REFERENCE.md) | Hold/input register definitions and control parameters |
| [docs/SCALING_GUIDE.md](docs/SCALING_GUIDE.md) | Scaling factors for raw API data |
| [docs/USAGE_GUIDE.md](docs/USAGE_GUIDE.md) | Comprehensive usage examples |
| [docs/DEVICE_TYPES.md](docs/DEVICE_TYPES.md) | Supported device types and capabilities |

The `docs/` index is at [docs/README.md](docs/README.md).

## Development

See [docs/DEVELOPMENT.md](docs/DEVELOPMENT.md). In short:

```bash
git clone https://github.com/joyfulhouse/pylxpweb.git
cd pylxpweb
uv sync
uv run pytest
uv run ruff check
uv run mypy
```

## Support

- Join the [JoyfulHouse Discord](https://discord.gg/gc4eTPwxjJ) for support and discussion across all JoyfulHouse Home Assistant integrations and libraries.
- **Issues:** <https://github.com/joyfulhouse/pylxpweb/issues>
- **PyPI:** <https://pypi.org/project/pylxpweb/>

## Support Development

If this library is useful to you, please consider supporting its development:

- [GitHub Sponsors][sponsors]
- [Ko-fi][kofi]

## License

This project is licensed under the **MIT** License — see [LICENSE](LICENSE) for details.

## Related Projects

- [EG4 Web Monitor][crosslink] — the Home Assistant integration built on this library.

## Credits

This project builds upon research and knowledge from the Home Assistant community.
Special thanks to the Home Assistant community for their pioneering work with EG4 and
Luxpower devices — API endpoint research, documentation, and best practices shaped this
library from the start.

**Disclaimer**: Unofficial library, not affiliated with Luxpower or EG4 Electronics.
Communicates with the official API using the same endpoints as the official web interface.

[pypi-shield]: https://img.shields.io/pypi/v/pylxpweb.svg?style=for-the-badge
[pypi]: https://pypi.org/project/pylxpweb/
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[kofi]: https://ko-fi.com/bryanli
[crosslink]: https://github.com/joyfulhouse/eg4_web_monitor

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